催化作用
氧化还原
化学
色散(光学)
钾
氧原子
石墨烯
氮原子
氮气
酯交换
串联
基础(拓扑)
氧气
无机化学
Atom(片上系统)
化学工程
纳米技术
分子
材料科学
有机化学
戒指(化学)
数学分析
物理
数学
工程类
光学
复合材料
计算机科学
嵌入式系统
作者
Song‐Song Peng,Xiang‐Bin Shao,Meng‐Xuan Gu,Guosong Zhang,Chen Gu,Yao Nian,Yiming Jia,You Han,Xiaoqin Liu,Lin Sun
标识
DOI:10.1002/anie.202215157
摘要
Solid superbases can catalyze diverse reactions under mild conditions, while they suffer from aggregation of basic sites and poor stability during recycling. Here we report a new generation of solid superbases derived from K single atoms (SAs) prepared by a tandem redox strategy. The initial redox reaction takes place between base precursor KNO3 and graphene support, producing K2 O at 400 °C. Further increasing the temperature to 800 °C, the graphene reduces K2 O to K anchored by its vacancies, leading to the generation of K SAs (denoted as K1 /G). The source of basicity in the K1 /G is K SAs, and neighboring single atoms (NSAs) possess superbasicity, which is different from conventional basicity originated from oxygen and nitrogen atoms. Due to the superbasicity as well as high dispersion and anchoring of basic sites, the K1 /G shows excellent catalytic activity and stability in transesterification reaction, which is much superior to the reported catalysts.
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